create_clock -period 20.000 -name clk [get_ports clk]
set_property IOSTANDARD LVCMOS33 [get_ports beep]
set_property IOSTANDARD LVCMOS33 [get_ports clk]
set_property IOSTANDARD LVCMOS33 [get_ports key_in]
set_property IOSTANDARD LVCMOS33 [get_ports rst_n]

set_property PACKAGE_PIN M14 [get_ports beep]
set_property PACKAGE_PIN L14 [get_ports key_in]
set_property PACKAGE_PIN U18 [get_ports clk]
set_property PACKAGE_PIN N16 [get_ports rst_n]
